In normal driving xDrive has a torque split that sends 40 per cent of the engine’s power to the front axle and 60 per cent to the rear axle. If the requirements change – perhaps because the various wheels have different levels of traction due to mud – sensors that also supply the vehicle’s DSC system with information will recognise this change. Based on the sensor data (speed, steering angle, wheel traction, yaw rate), a control unit then calculates the appropriate torque split between the two axles.
Torque split adjustments are fully variable. If necessary, almost 100 per cent of the available drive power can be channelled to the secondary axle alone. The process is so fast and smooth that the driver isn’t even aware of it. An electronically controlled multi-plate clutch adjusts the torque split as required.
There’s a world of science and technology behind the xDrive technology that helps keep you safe. Find out more with BMW.